Morning Market Gainers

Capnia IncCAPN

shares climbed 35.50 percent to $2.74 after the company reported that it has acquired substantially all assets from privately-held NeoForce Group, Inc.

TECO Energy, Inc. TE

shares surged 21.63 percent to $25.64 after the company announced it will be acquired by Emera Inc for $10.4 billion.

Nanosphere, Inc. NSPH

rose 19.22 percent to $3.22 after the company reported that it has received FDA clearance for its Verigene(R) Respiratory Pathogens Flex Nucleic Acid Test.

Immunomedics, Inc. IMMU

shares climbed 14.74 percent to $2.47 following announcement of interim Phase 2 Results with sacituzumab govitecan in lung cancers.

Meredith CorporationMDP

rose 11.56 percent to $51.25 after

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Media General IncMEG

agreed to acquire Meredith for approximately $2.4 billion.

Fitbit IncFIT

shares gained 8.38 percent to $34.55. Morgan Stanley upgraded Fitbit from Equal-weight to Overweight and raised the price target from $43 to $58.

Tower Semiconductor Ltd. (USA) TSEM

rose 8.14 percent to $13.55 after the company reported that it has signed a definitive agreement with one of its customers to receive $30 million advance payment for capacity expansion.

Gevo, Inc. GEVO

gained 5.17 percent to $2.44 as the company provided an update on impact of settlement with Butamax.

Achillion Pharmaceuticals, Inc. ACHN

shares rose 4.14 percent to $8.06. UBS upgraded Achillion Pharmaceuticals from Neutral to Buy.